A person or device that adjusts or checks measuring instruments to ensure they show accurate readings.
From calibrate (from caliber plus the suffix -ate meaning 'to make') plus -er meaning 'one who does' or 'thing that does.' Calibrate emerged in the 18th century as scientific precision became increasingly important.
Before modern electronic systems, professional calibraters were like doctors for measuring equipment—they'd check thermometers, scales, and instruments to make sure scientists weren't accidentally lying to themselves with broken tools!
Complete word intelligence in one call. Free tier — 50 lookups/day.